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  • SQL SERVER – When are Statistics Updated – What triggers Statistics to Update

    - by pinaldave
    If you are an SQL Server Consultant/Trainer involved with Performance Tuning and Query Optimization, I am sure you have faced the following questions many times. When is statistics updated? What is the interval of Statistics update? What is the algorithm behind update statistics? These are the puzzling questions and more. I searched the Internet as well many official MS documents in order to find answers. All of them have provided almost similar algorithm. However, at many places, I have seen a bit of variation in algorithm as well. I have finally compiled the list of various algorithms and decided to share what was the most common “factor” in all of them. I would like to ask for your suggestions as whether following the details, when Statistics is updated, are accurate or not. I will update this blog post with accurate information after receiving your ideas. The answer I have found here is when statistics are expired and not when they are automatically updated. I need your help here to answer when they are updated. Permanent table If the table has no rows, statistics is updated when there is a single change in table. If the number of rows in a table is less than 500, statistics is updated for every 500 changes in table. If the number of rows in table is more than 500, statistics is updated for every 500+20% of rows changes in table. Temporary table If the table has no rows, statistics is updated when there is a single change in table. If the number of rows in table is less than 6, statistics is updated for every 6 changes in table. If the number of rows in table is less than 500, statistics is updated for every 500 changes in table. If the number of rows in table is more than 500, statistics is updated for every 500+20% of rows changes in table. Table variable There is no statistics for Table Variables. If you want to read further about statistics, I suggest that you read the white paper Statistics Used by the Query Optimizer in Microsoft SQL Server 2008. Let me know your opinions about statistics, as well as if there is any update in the above algorithm. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, Readers Question, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: SQL Statistics

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  • SQL SERVER When are Statistics Updated What triggers Statistics to Update

    If you are an SQL Server Consultant/Trainer involved with Performance Tuning and Query Optimization, I am sure you have faced the following questions many times.When is statistics updated? What is the interval of Statistics update? What is the algorithm behind update statistics? These are the puzzling questions and more.I searched the Internet as well many [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • View/ViewModel Interaction - Bindings, Commands and Triggers

    It looks like I have a set of posts on ViewModel, aka MVVM, that have organically emerged into a series or story of sorts. Recently, I blogged about The Case for ViewModel, and another on View/ViewModel Association using Convention and Configuration, and a long while back now, I posted an Introduction to the ViewModel Pattern as I was myself picking up this pattern, which has since become the natural way for me to program client applications. This installment adds to this on-going series. I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • View/ViewModel Interaction - Bindings, Commands and Triggers

    It looks like I have a set of posts on ViewModel, aka MVVM, that have organically emerged into a series or story of sorts. Recently, I blogged about The Case for ViewModel, and another on View/ViewModel Association using Convention and Configuration, and a long while back now, I posted an Introduction to the ViewModel Pattern as I was myself picking up this pattern, which has since become the natural way for me to program client applications. This installment adds to this on-going series. I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Row Oriented Security Using Triggers

    Handling security in an application can be a bit cumbersome. New author R Glen Cooper brings us a database design technique from the real world that can help you. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • importing a mysqldump file does not import triggers due to some permission problems

    - by user51792
    Hello, Whenever I try to import a mysqldump export on another server, the triggers are never created, and if I remember correctly, I get an error messages that super user permission is required. IF I remove the definer it usually works but if there is a way I would prefer not having to edit the sql file. When I just simply copy over the mdi, mdy and frm files everything works perfectly. How could I import a mysqldump file so that triggers are created as well?

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  • Comment Déboguer les procédures, fonctions et triggers sous SSMS 2008, par hmira

    hmira nous propose un article qui explique comment déboguer une procédure stockée, une fonction ou un trigger sous SSMS 2008 (SQL Server 2008 Management Studio). Celui-ci décrit la manière de définir des points d'arrêts, faire du pas à pas dans les blocs T-SQL, consulter le contenu des variables locales et variables systèmes @@, etc.. Merci à lui >> Pour plus de détails Vos remarques et suggestions sont les biens venus. A+...

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  • Avoid External Dependencies in SQL Server Triggers

    I sometimes want to perform auditing or other actions in a trigger based on some criteria. More specifically, there are a few cases that may warrant an e-mail; for example, if a web sale takes place that requires custom or overnight shipping and handling. It is tempting to just add code to the trigger that sends an e-mail when these criteria are met. But this can be problematic for two reasons: (1) your users are waiting for that processing to occur, and (2) if you can't send the e-mail, how do you decide whether or not to roll back the transaction, and how do you bring the problem to the attention of the administrator?

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  • 2 Google Tag Manager containers = double triggers?

    - by fred
    I have a Joomla website with existing analytics done by a GTM tag and I need to add another image tag (1x1 pixel) from a separate GTM container. I set the event name for the additional GTM container to a different name from from the existing GTM container (default 'gtm.js') so that the new tag only fires under the specified event. The new container tested out fine in a blank HTML page, but when it is put in the website, it ends up firing twice. I know that because Firebug showed 2 1x1 pixels being loaded and I mark each request with a randomly-generated UID to distinguish them on the server side. I suspect this being caused by having multiple GTM container tags but want to check whether anyone has run into this problem before? As of now, I could not verify nor fix the double counting problem.

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  • MySQL Triggers - How to capture external web variables? (eg. web username, ip)

    - by Ken
    Hi, I'm looking to create an audit trail for my PHP web app's database (eg. capture inserts, updates, deletes). MySQL triggers seem to be just the thing -- but how do I capture the IP address and the web username (as opposed to the mysql username, localhost) of the user who invoked the trigger? Thanks so much. -Ken P.S. I'm working with this example code I found: DROP TRIGGER IF EXISTS history_trigger $$ CREATE TRIGGER history_trigger BEFORE UPDATE ON clients FOR EACH ROW BEGIN IF OLD.first_name != NEW.first_name THEN INSERT INTO history_clients ( client_id , col , value , user_id , edit_time ) VALUES ( NEW.client_id, 'first_name', NEW.first_name, NEW.editor_id, NEW.last_mod ); END IF; IF OLD.last_name != NEW.last_name THEN INSERT INTO history_clients ( client_id , col , value , user_id , edit_time ) VALUES ( NEW.client_id, 'last_name', NEW.last_name, NEW.editor_id, NEW.last_mod ); END IF; END; $$

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  • need export query rather than creating file for mysqldump without triggers.. See description

    - by OM The Eternity
    I have code as $db_name = "db"; $outputfile = "/somewhere"; $new_db_name = 'newdb'; $cmd = 'mysqldump --skip-triggers %s > %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); if ($ret !=0 ) { //log error message in $output } Then to import: $cmd = 'mysql --database=%s < %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($new_db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); //etc. unlink($outputfile); Bow here what should i do to get the export query, rather than creating a file everytime?

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  • Is the syntax written in descrition is correct for MySQL Triggers? will it work?

    - by Parth
    Is the syntax written in descrition is correct for MySQL Triggers? will it work? CREATE OR REPLACE TRIGGER myTableAuditTrigger 2 AFTER INSERT OR DELETE OR UPDATE ON myTable 3 FOR EACH ROW 4 BEGIN 5 IF INSERTING THEN 6 INSERT INTO myTableAudit (id, Operation, NewName, NewPhone) 7 VALUES (1, 'Insert ', :NEW.Name, :NEW.PhoneNo); 8 ELSIF DELETING THEN 9 INSERT INTO myTableAudit (id, Operation, OldName, OldPhone) 10 VALUES (1, 'Delete ', :OLD.Name, :OLD.PhoneNo); 11 ELSIF UPDATING THEN 12 INSERT INTO myTableAudit (id, Operation, 13 OldName, OldPhone, NewName, NewPhone) 14 VALUES (1, 'Update ', 15 :OLD.Name, :OLD.PhoneNo, :NEW.Name, :NEW.PhoneNo); 16 END IF; 17 END; 18 /

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  • Refactoring PL/SQL triggers - extract procedures

    - by Juraj
    Hello, we have application where database contains large parts of business logic in triggers, with a update subsequently firing triggers on several other tables. I want to refactor the mess and wanted to start by extracting procedures from triggers, but can't find any reliable tool to do this. Using "Extract procedure" in both SQL Developer and Toad failed to properly handle :new and :old trigger variables. If you had similar problem with triggers, did you find a way around it? EDIT: Ideally, only columns that are referenced by extracted code would be sent as in/out parameters, like: Example of original code to be extracted from trigger: ..... if :new.col1 = some_var then :new.col1 := :old.col1 end if ..... would become : procedure proc(in old_col1 varchar2, in out new_col1 varchar2, some_var varchar2) is begin if new_col1 = some_var then new_col1 := old_col1 end if; end; ...... proc(:old.col1,:new.col1, some_var);

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  • Understanding Zabbix Triggers

    - by Mediocre Gopher
    I have zabbix set with an item to monitor a log file on a zabbix client: log["/var/log/program_name/client.log","ERROR:","UTF-8",100] And a trigger to determine when that log file get's more ERRORs: {Template_Linux:log["/var/log/program_name/client.log","ERROR:","UTF-8",100].change(0)}#0 This trigger gets tripped when the log file gets ERRORs the first time, but then that first trigger just sits around for ever in Monitoring-Triggers. My understanding is that the next time the server checks the value of log["/var/log/program_name/client.log","ERROR:","UTF-8",100] and sees that it hasn't changed that the trigger would go away. Obviously this isn't the case. Could someone explain why this first trigger isn't going away? Ultimately my goal is to receive an email whenever ERRORs are added to that log file, but I would like to understand how triggers are working first.

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  • Connect Digest : 2012-07-06

    - by AaronBertrand
    I've filed a few Connect items recently that I think are important. In #752210 , I complain that the documentation for DDL triggers suggests that they can prevent certain DDL from being run, which is not the case at all. http://connect.microsoft.com/SQLServer/feedback/details/752210/doc-ddl-trigger-topic-suggests-that-rollbacks-run-before-action In #745796 , I complain that scripting datetime data in Management Studio yields output that contains a binary representation instead of a human-readable...(read more)

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  • Connect Digest : 2012-07-06

    - by AaronBertrand
    I've filed a few Connect items recently that I think are important. In #752210 , I complain that the documentation for DDL triggers suggests that they can prevent certain DDL from being run, which is not the case at all. http://connect.microsoft.com/SQLServer/feedback/details/752210/doc-ddl-trigger-topic-suggests-that-rollbacks-run-before-action In #745796 , I complain that scripting datetime data in Management Studio yields output that contains a binary representation instead of a human-readable...(read more)

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  • Are there clean ways to do these Quartz Triggers?

    - by Ryan Elkins
    I'm using Quartz to schedule some jobs but I have a few scenarios that I'm not sure how to resolve. 1) Lets say I have a job that is scheduled to run every 5 minutes. Generally that works well but periodically the job takes more than 5 minutes and I don't really want multiple instances of the job running simultaneously. 2) I have a job that can take between 1 and 60 minutes to complete. I want it to run continuously but pause for 10 minutes between runs, regardless of how long it took previously. I like using Quartz for this rather than some sort of loop because if a job crashes Quartz will still spin up a new one based on the schedule. I am using Quartz in Java right now.

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  • MySQL triggers cannot update rows in same table the trigger is assigned to. Suggested workaround?

    - by Cory House
    MySQL doesn't currently support updating rows in the same table the trigger is assigned to since the call could become recursive. Does anyone have suggestions on a good workaround/alternative? Right now my plan is to call a stored procedure that performs the logic I really wanted in a trigger, but I'd love to hear how others have gotten around this limitation. Edit: A little more background as requested. I have a table that stores product attribute assignments. When a new parent product record is inserted, I'd like the trigger to perform a corresponding insert in the same table for each child record. This denormalization is necessary for performance. MySQL doesn't support this and throws: Can't update table 'mytable' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. A long discussion on the issue on the MySQL forums basically lead to: Use a stored proc, which is what I went with for now. Thanks in advance!

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  • Stop invalid data in a attribute with foreign key constraint using triggers?

    - by Eternal Learner
    How to specify a trigger which checks if the data inserted into a tables foreign key attribute, actually exists in the references table. If it exist no action should be performed , else the trigger should delete the inserted tuple. Eg: Consider have 2 tables R(A int Primary Key) and S(B int Primary Key , A int Foreign Key References R(A) ) . I have written a trigger like this : Create Trigger DelS BEFORE INSERT ON S FOR EACH ROW BEGIN Delete FROM S where New.A <> ( Select * from R;) ); End; I am sure I am making a mistake while specifying the inner sub query within the Begin and end Blocks of the trigger. My question is how do I make such a trigger ?

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  • How to use External Procedures in Triggers on Oracle 11g..

    - by RBA
    Hi, I want to fire a trigger whenever an insert command is fired.. The trigger will access a pl/sql file which can change anytime.. So the query is, if we design the trigger, how can we make sure this dynamic thing happens.. As during the stored procedure, it is not workingg.. I think - it should work for 1) External Procedures 2) Execute Statement Please correct me, if I am wrong.. I was working on External Procedures but i am not able to find the way to execute the external procedure from here on.. SQL> CREATE OR REPLACE FUNCTION Plstojavafac_func (N NUMBER) RETURN NUMBER AS 2 LANGUAGE JAVA 3 NAME 'Factorial.J_calcFactorial(int) return int'; 4 / @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ SQL> CREATE OR REPLACE TRIGGER student_after_insert 2 AFTER INSERT 3 ON student 4 FOR EACH ROW How to call the procedure from heree... And does my interpretations are right,, plz suggest.. Thanks.

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  • How to use Externel Procedures in Triggers on Oracle 11g..

    - by RBA
    Hi, I want to fire a trigger whenever an insert command is fired.. The trigger will access a pl/sql file which can change anytime.. So the query is, if we design the trigger, how can we make sure this dynamic thing happens.. As during the stored procedure, it is not workingg.. I think - it should work for 1) External Procedures 2) Execute Statement Please correct me, if I am wrong.. I was working on External Procedures but i am not able to find the way to execute the external procedure from here on.. SQL> CREATE OR REPLACE FUNCTION Plstojavafac_func (N NUMBER) RETURN NUMBER AS 2 LANGUAGE JAVA 3 NAME 'Factorial.J_calcFactorial(int) return int'; 4 / @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ SQL> CREATE OR REPLACE TRIGGER student_after_insert 2 AFTER INSERT 3 ON student 4 FOR EACH ROW How to call the procedure from heree... And does my interpretations are right,, plz suggest.. Thanks.

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  • What to consider if using triggers on tables in a sql-server merge replication

    - by Ice
    Hi, i am driving since some years a sql-server2000 merge-replication over three locations. Triggers do a lot of work in this database. i got no troubles. Now migrating these database to a brand new sql2008, i got some issues about the triggers. They are firing even if the merge-agent does his work. Is there anybody who has some experience with that kind of stuff on sql2008-server? Can anybody confirm that different behaviour to sql2000? Peace Ice

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